This study aims to comprehensively examine the role of social media as a digital marketing strategy in transforming consumer behavior patterns, with a primary focus on the effectiveness of social media platforms at each stage of the purchase decision-making process. Using a literature review method and a qualitative approach, this research analyzes various findings from relevant literature to understand the dynamics of interaction between digital marketing strategies on social media and changes in contemporary consumer behavior. The results show that social media plays a strategic role in building brand awareness through the dissemination of engaging visual content, collaborations with influencers, and the delivery of personalized marketing messages. In the context of digital marketing strategy, social media facilitates the consideration stage by providing easy access to product reviews, recommendations from social networks, and direct interactions between consumers and brands. During the evaluation and decision-making stages, digital marketing strategies on social media reinforce consumer trust through social proof such as testimonials and positive reviews, as well as enabling retargeting based on consumer behavioral data. Furthermore, in the post-purchase stage, digital marketing strategies on social media serve as a means of fostering customer loyalty through responsive feedback management and the formation of active customer communities. This study concludes that social media as a digital marketing strategy has evolved into a holistic marketing ecosystem, not only transforming purchasing behavior but also creating long-term emotional relationships between brands and consumers. These findings provide important contributions to the development of more effective, ethical, and sustainable digital marketing strategies in the current era of digital transformation.